Collapsible core



EL w. DoAK COLLAPSIBLE CORE Aug. 25, 1.925.`

Filed June 2s, 1920 2 Sheng-sheet 2 .INV N OR .Book

5% ATTOR Y 1 Patented Ang.. 25, 1925.

ERNEST W. .'DOAK, 0F PONTIAC, MICHIGAN.

COLLAPSIBLE CORE.

Application filed .Tune 28, 1920. Serial No. 392,151.

To all whom t may concern:

Be it known that I, 4ERNEST W. Donn, a citizen of the United States of America, residing at Pontiac., in the county of Oakland and State of Michigan, have invented certain new and useful improvements in a Collapsible Core, of which the following is a specification.

My invention relates to cores particularly designed for use in the manufacture of automobile tire casings, and specifically relates to a construction of such cores which peiqu mits their being taken apart so that they may be readily removed from the casing.

It has for its object a. core which can be rapidly assembled and disassembled, which will have a minimum of loose and disconnected parts when collapsed, and which will be rigid when assembled. It has other and further objects which will cppear from the accompanying description and drawings.

rIhe improved core will now be described with particular reference to the accompanying drawings, in which Fig. 1 is ai side elevation of a core embodying my invention, partly in section, the locking ring being shown in position for disassembling the core;

Fig. 2 is a similar view showing the parts in locked position;

Fig. 3 is a section on line 3-8 of Fig. 1;

Fig. 4 is a section on line 4 4 of Fig. 1;

Fig. 5 is a view of the core sections with the locking ring removed, the section being shown slightly separated to illustrate how the core is taken apart;

Fig. 6 is a fragmentary elevation taken in the direction of the arrow 6 in Fig. 4; and

Fig. 7 is a fragmentary elevation talren in the direction of the arrow 7 in Fig. 4.

rIhe core is composed of a series of sections 10, 11, 12 and 13, the first named of which is so shaped as to permit of its being drawn radially inwardlyT (see Fig. 5) when it is desired to remove the core from a tire. The core sections are of the usual rounded cross-section, being provided with a necked portion 14 and a generally round portion 15. The necked portion 14 is provided with notches 16 which have lugs 17 between them. A ring 18 (Figs. 3, 4 and 7 is provided with notches 19 and lugs 20 corresponding to the notches and lugs on the core sections. This ring is fastened by bolts 21 to a ring 22 which is preferably continuous and not provided with notches and lugs.

ln operation, assuming the core to be in the assembled and locked position of Fig. 2, bolts 21 are loosened (but preferably not removed), and rings 18 and 22 are rotated until lugs 2O are opposite notches 16 (Fig. 1), when the rings can be axially separated from the core sections, leaving the latter free to be individually removed from the tire (Fig. 5). rlhe operation of assembling the core is exactly the converse. After the core sections are arranged in proper posi- H tion the locking rings are applied by passing lugs 2O through notches 16, rotating the rings until lugs 20 come behind lugs 17 and then tightening bolts 21.

In order to facilitate the operation of the core various devices may be incorporated. A slight sepa-ration of the plates 18 and 22 upon the release of bolts 21 is accomplished by springs 23 seated in recesses 24 in plate 22 and bearing a'gainst plate 18. The action of these springs is to reduce the friction between the plates and the lugs 17 during the rotation of the plates to and from locking position. It is further desirable to provide a stop so that the plates will not be rotated beyond locking position. In the present instance this is accomplished by attaching a plate 25 to the end of one of the lugs 17 as by a screw 26. This plate projects into the path of lug 20, as shown in Fig. 4, and will limit the extent of its rotative movement. As a convenience in handling the rings, one of them may be provided with handles 27. The spacing of the lugs and notches may be varied without departing from the invention.

I claim:

1. A collapsible core having a plurality of separable sections, the inner peripheries of which are formed with alternate notches and lugs, means for clamping the sections to*- gether comprising a pair of rings, one of 'which is provided with alternate notches and lugs, means for drawing said rings together, and means tending to separate the rings when the drawing means is released.

2. A collapsible core having a plurality of separable sections, the inner peripheries of which are formed with alternate notches and lugs, means for clamping the sections together comprising a pair of rings, one of which is provided with alternate notches and lu O's 'rings when the drawing means is released.

3. A collapsible core having a plurality of separable sections, the inner peripheries of which are formed With alternate notches and lugs, means for clamping the sections together including members adapted to pass through said notches and to be rotated to position behind the lugs, and a stop for preventing rotation of such members beyond their intended position.

l. A collapsible co-re having a plurality of separable sect-ions, the inner peripheries of which are formed with alternate notches and lugs, a pair of rings ot' which one is continuous and the other provided With lugs adapted to pass through the notches in the sections and to be brought into position back of the lugs on the sections by rotation of the ring, a. stop for preventing rotation of the ring lugs beyond their intended positions, and means for drawing the rings together to hold the sections in assembled relation.

5. A collapsible core having a. plurality of separable sections, the inner peripheries of which are formed With alternate notches and lugs, a pair of connected rings adapted to be drawn together to hold the sections in assembled relation, one of the rings being notched to permit it to pass the lugs on the core sections, and the other being so formed as to hold the notched ring after it has passed the lugs in position so that simultaneous rotation of the rings Will carry the unnotched portions of the notched ring behind the lugs on the core sections, means for dra-Wing the rings together, and a stop for preventing rotation of the rings beyond their intended positions.

6. A collapsible annular core having a plurality oi sections some of which are different arcuate lengths from others as measured on the inner circumference of the annulus, said sections having on their inner peripheries lugs of a greater number than the number of core sections and equally spaced around the circumference when the core is assembled, and a pair of rings adapted to hold the sections in assembled relation, one of the rings being notched evenly around its outer periphery to permit it to pass the lugs on the core sections.

ERNEST W. DOAK. 

